Informal contractions are short forms of other words that people use when speaking casually. Here you have some links to practice this topic:
EnglishClub: Informal Contractions
RealLife English: How English is Really Spoken
Archivos de la categoría: pronunciation
Final -s pronunciation
The final -s in the third person in present simple and in plurals can be pronounced in three different ways. Here you have some links to know more about this:
Woodward English: Pronunciation of final -s
